Jul 1, 2013

I set out to make a great tasting grilled portobello mushroom burger that even a meat lover would love. The mushrooms are marinated then grilled and topped with melted Swiss Cheese, grilled red onion, tomatoes, spinach, and avocado – yum!!

The only thing my husband said would make these burgers better is adding bacon... maybe next time.
I wanted to give the mushrooms a meaty flavor, so I marinated them with balsamic, soy sauce and Montreal steak seasoning. These were so good, perfect for meatless Mondays or any night of the week.

In a large bowl, whisk together vinegar, soy sauce, oil, rosemary, and Montreal steak seasoning. Place the mushroom caps in the bowl and toss with sauce, using a spoon to evenly coat. Let stand at room temperature for 20 to 30 minutes, turning a few times.

Heat the grill or indoor grill pan over medium heat. When hot, brush the grate with oil or lightly spray the grill pan. Place the mushrooms on the grill, reserving marinade for basting. Grill for 5 to 7 minutes on each side, or until tender, brushing with marinade frequently.

Top the mushrooms with cheese during the last minute of cooking. While the mushrooms cook, grill the onions about 1 minute on each side and grill the buns until toasted.

To finish, place the spinach and grilled portobello mushrooms on the buns and top with the grilled onions, sliced tomato and avocado.

Thanks so much for this recipe and for being so responsive to your fans! I'm sure I'm not the only one, but I e-mailed you a couple of weeks ago asking for a Portobello Mushroom Burger recipe! You're amazing, thanks again!

I scrape mine out with a small spoon. I actually used to use a grapefruit spoon (has a kinda serrated edge) but husband mangled it in the garbage disposal. :( I like the texture better without the gills.

I honestly have NEVER liked portobello mushrooms, but I liked all the other ingredients and became intrigued by how you flavored them so I thought I'd try it. OMG best burger I've EVER had, I did throw in a slice of turkey bacon just in case, but it didn't "need" it. I'm so excited by this recipe, because I love burgers, but try to stay away from the red meat. Just thought I'd let you know how much I appreciate it, thank you!!

Michelle, I found your review incredibly helpful because I find I am indecisive about mushrooms. I've always wanted to try portobello burgers but have been too scared to try them and yet I find myself time and time again looking at recipes of them. Because of your review, I will be trying them tonight!

I made this for my dinner tonight -- O.M.G. it was the juiciest & most delish portabello burger!! I used to make a Weight Watcher recipe for one, but this was much better. I didn't have the Montreal steak seasoning so I just seasoned the marinade with garlic, pepper, onion powder. I also made a quick little sauce using fat free mayo mixed with dijon mustard, fresh ground flower pepper, garlic, and rosemary (it's just like the sauce they use at Five Napkin Burger in NYC, but mine was fat free!)).....total WOW factor for this "burger!!!!

Had it twice now (sans the avocado and tomato), and i still cannot believe how awesome this is.... the marinade for the portobello is awesome, and the cheddar, grilled onion and teh bun definitely make you believe this is a burger...just a juicier burger than I'm used to, so I'll probably prefer this one to a meat patty in the future (the funny thing is that I'm not a vegetarian, but I already discovered that lentils are better than ground beef in a sloppy joe, so this didn't come as a complete surprise!)

I made these tonight and loved the recipe! Even my husband, who hates mushrooms, took a bite and said "I could eat a whole one!" (He ate a salmon burger instead.) Thanks for the great recipe... we'll be making this again!

May I ask which kind of indoor grill pan you use? I see that you did not use one in the pictures above for this recipe, but I've seen you post pics where you use one with different recipes. I don't have one yet, but I think that it would be nice to have as a Chicagoan once the weather starts to cool down.

So delicious! Broiled them rather than grilling because I could only find sliced portobellos. I didn't want them to fall through the grill! 5 minutes on each side, applying marinade at the flip. Just used a generic steak seasoning. Very, very good - will be making again!

I made these last night and they were delicious! It was my first ever portobello burger. I did, however, find them VERY juicy (to the point that they were difficult to eat as a burger). Just wondering if I did something wrong or if that is typical of a portobello burger?

I made this today and they came out amazing. I don't like really juicy food , so what I did was poke the cap with a fork several times. This helped release any excess juice without leaving it dry. Will defiantly make again!

These are FANTASTIC - definitely a keeper! I never would have guessed a mushroom could be sooooooooo juicy. We have vegetarian friends arriving today for a visit and we're grilling these up tonight for dinner :)

Amazing! Made these tonight on our grill pan and my husband had 2 he isn't a mushroom fan even -will definitely make these again! I didn't have rosemary but used French thyme instead and came out delicious!

I imagine this would be a great vegan burger, but I made the mushrooms to go on top of steak...it was outstanding and very delicious. I usually don't like balsamic vinegar but this recipe was quite good

I made these today for dinner. I removed the gills, used a fry pan - no grill, and fried the onions till brown. The marinade was perfect, and so was the burger. I always had trouble finding a marinade I liked. This is a winner.

Seriously Excellent....added one finely minced garlic clove....used Braggs Amino for soy sauce and only 1/2 teaspoon Montreal Seasoning to cut back on salt.....grilled both sides......definitely our new favorite.

I have made these several times and they are excellent. My meat loving husband said he did not miss the meat! Thanks Gina I'm not on WW but diabetic and have made several of your recipes to eat healthier and have loved everything I've tried...can't wait for your cookbook!

This was delicious! I added a twist. Instead of cheese I used Nutritional Yeast flakes. They melt like a cheese and taste pretty close with almost no fat, 0 cholesterol but 9 grams of protein for a 3TB serving! I did everything else exactly per the recipe. Yummy. thanks! JM :)

Thank you so much for this delicious mouthful of fungi wonderfulness! :) OMGoodness! My first ime cooking portobello mushrooms but it won't be the last! The marinade is fantastic ! I sliced off the gills and used my cast iron fry pan and magically delectable. Two thumbs up!! djoy4 fromm Raleigh, NC

OMG!!! This burger looks amazing! It looks fancy and delicious and also healthy! I will definitely try this recipe because I want to start eat clean but I want to continue to eat delicious food. Regards! Eastcote Carpet Cleaners Ltd.